Dominion 7.5 in Osaka-jo Hall was a professional wrestling pay-per-view (PPV) promoted by New Japan Pro Wrestling (NJPW). The event took place on July 5, 2015, in Osaka, Osaka, at the Osaka-jō Hall. The event featured ten matches (including one dark match) with all six of NJPW's championships on the line, main evented by an IWGP Heavyweight Championship match between champion A.J. Styles and challenger Kazuchika Okada. In addition to airing worldwide through NJPW's internet streaming site, New Japan Pro Wrestling World, the event also aired in Japan as a regular PPV through SKY PerfecTV!. The event marked NJPW's first show in Osaka-jō Hall in 21 years and drew 11,400 fans to the arena. This was the seventh event under the Dominion name and the first to take place in July.

Dominion 7.5 in Osaka-jo Hall was announced on November 8, 2014, during the Power Struggle event in Osaka. The event would mark NJPW's first show in the Osaka-jō Hall in 21 years. NJPW president Kaname Tezuka revealed that the decision to hold a show in the venue was made after the promotion sold out Osaka's Bodymaker Colosseum four times during 2014, claiming that they needed a bigger venue for the market. The event was to be part of NJPW's 2015 goal of expanding their presence in western Japan. The event was compared to 2014's Back to the Yokohama Arena, which was NJPW's first event in eleven years at the Yokohama Arena, but which was also ultimately deemed a failure for the company, drawing only an attendance of 7,800. Daily Sports wrote that it was imperative for NJPW to do better with Dominion 7.5 in Osaka-jo Hall, which could be seen by the promotion putting together a studded card, featuring matches for all six of its championships. All seated tickets for the event were sold out in advance.

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